GATE EE 2014 Set 3 — Question 25
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Power Systems → Fault Analysis → Symmetrical Components
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Question
For a fully transposed transmission line
Correct answer
(B) positive and negative sequence impedances are equal
Solution
In a fully transposed transmission line, the symmetry ensures that the mutual effects between phases are balanced. For static (non-rotating) components like transmission lines and transformers, the positive sequence impedance () and negative sequence impedance () are always equal. The zero sequence impedance () is generally different and larger due to the ground return path.
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